Abstract
In this study, a targeted oxygen-enrichment technology was proposed to enhance coal combustion in an ironmaking blast furnace. The coal flow and combustion characteristics under targeted oxygen-enrichment were investigated using the computational fluid dynamics (CFD) method. The results showed that oxygen utilization and coal burnout were significantly increased under targeted oxygen-enrichment. The coal burnout at 24% O2 concentration was 86.29%, which was the maximum and indicated an increase of 13.13%. However, the cooling effect of room-temperature oxygen had some adverse effects on coal combustion. Given this, the effect of coal particle temperature on coal combustion was investigated based on targeted oxygen-enrichment. The coal combustion process was further enhanced. The coal burnout at a 600 K particle temperature and 25% oxygen concentration was 91.12% and had an increase of 17.96%, which was the maximum.
Highlights
The ironmaking blast furnace is the main facility for hot metal production and more than 94% of pig iron is produced by it due to its higher productivity and competitive production costs [1,2,3,4,5]
The coke involved in this process must be used during the blast furnace production process and about 350 kg of coke will be consumed for a tonne of hot metal
An adverse effect is produced with an increase of the pulverized coal injection ratio
Summary
The ironmaking blast furnace is the main facility for hot metal production and more than 94% of pig iron is produced by it due to its higher productivity and competitive production costs [1,2,3,4,5]. The injection of pulverized coal through tuyeres in the lower part of the blast furnace can effectively reduce the use of coke. An adverse effect is produced with an increase of the pulverized coal injection ratio. Shen et al [7,16,17] investigated the coal flow and combustion characteristics in the ironmaking blast furnace using the CFD method. The coal combustion process in an ironmaking blast furnace under targeted oxygen-enrichment was investigated using CFD. The effect of coal particles temperature based on targeted oxygen-enrichment was investigated. The present study could provide useful insights into the development of pulverized coal injection technology with oxygen enrichment on the ironmaking blast furnace
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